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From: Vincent Jardin <vjardin@wanadoo.fr>
To: "Radoslav Vasilev" <rado@cablebg.net>, <freebsd-net@freebsd.org>
Subject: Re: kld && inetsw.pr_protocol overriding + old reuse
Date: Tue, 14 Jan 2003 07:22:05 +0100
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It is not very simple. However Netgraph/ng_socket.c does something similar.

net_add_domain is called from ngs_mod_event().

However, it is not possible to remove this module because the feature to 
remove a domain is missing.

        switch (event) {
        case MOD_LOAD:
                /* Register protocol domain */
                net_add_domain(&ngdomain);
                break;
        case MOD_UNLOAD:
                /* Insure there are no open netgraph sockets */
                if (!LIST_EMPTY(&ngsocklist)) {
                        error = EBUSY;
                        break;
                }

#ifdef NOTYET
                if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
                /* Unregister protocol domain XXX can't do this yet.. */
                        if ((error = net_rm_domain(&ngdomain)) != 0)
                                break;
                } else
#endif
                        error = EBUSY;
                break;


I would be interested in this feature too ;-)
However there is no reference counter within the protosw structure, neither 
within the domain structure. It seems to be difficult to remove them.

Moreover, how can the domains, that require a "routing layer", be loaded ? 
rn_init is called only during the boot process in order to find the 
max_keylen = MAX(dom->dom_maxrtkey).

Vincent

Le Mardi 14 Janvier 2003 00:53, Radoslav Vasilev a écrit :
> I'm interested in whether the following could be acomplished:
> there's KLD module, installing some new syscalls in the kernel, as well as
> installing new ``struct ipprotosw'' for some protocol or another(let's
> assume IPPROTO_UDP).
> Could we just add some code in the begging of the new protocol handler
> (counting, statistics , etc...)  and call the old  one after doing that. If
> possible, what should be the preparation for that last call ?
> Any help appreciated!
>
>
>
>
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